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Sialic acid is a generic term for the N- or O-substituted derivatives of neuraminic acid, a monosaccharide with a nine-carbon backbone. It is also the name for the most common member of this group, N-acetylneuraminic acid (Neu5Ac or NANA). Sialic acids are found widely distributed in animal tissues and to a lesser extent in other organisms, ranging from plants and fungi to yeasts and bacteria, mostly in glycoproteins and gangliosides (they occur at the end of sugar chains connected to the surfaces of cells and soluble proteins). That is because it seems to have appeared late in evolution. However, it has been observed in Drosophila embryos and other insects and in the capsular polysaccharides of certain strains of bacteria. In humans the brain has the highest sialic acid concentration where they have an important role in neural transmission and ganglioside structure in synaptogenesis. In general, the amino group bears either an acetyl or a glycolyl group, but other modifications have been described. These modifications along with linkages have shown to be tissue specific and developmentally regulated expressions, so some of them are only found on certain types of glycoconjugates in specific cells. The hydroxyl substituents may vary considerably; acetyl, lactyl, methyl, sulfate, and phosphate groups have been found. The term "sialic acid" (from the Greek for saliva, σίαλον/sialon) was first introduced by Swedish biochemist Gunnar Blix in 1952.
Sialic acids' family includes 43 derivatives of the nine-carbon sugar neuraminic acid, but these acids unusually appear free in nature. Normally they can be found as components of oligosaccharide chains of mucins, glycoproteins and glycolipids occupying terminal, nonreducing positions of complex carbohydrates on both external and internal membrane areas where they are very exposed and develop important functions.
The numbering of the sialic acid structure begins at the carboxylate carbon and continues around the chain. The configuration that places the carboxylate in the axial position is the alpha-anomer.
The alpha-anomer is the form that is found when sialic acid is bound to glycans. However, in solution, it is mainly (over 90%) in the beta-anomeric form. A bacterial enzyme with sialic acid mutarotase activity, NanM, that is able to rapidly equilibrate solutions of sialic acid to the resting equilibrium position of around 90% beta/10% alpha has been discovered.
Sialic acid is synthesized by glucosamine 6 phosphate and acetyl CoA through a transferase, resulting in N-acetylglucosamine-6-P. This becomes N-acetylmannosamine-6-P through epimerization, which reacts with phosphoenolpyruvate producing N-acetylneuraminic-9-P (sialic acid). For it to become active to enter in the oligosaccharide biosynthesis process of the cell, a monophosphate nucleoside is added, which comes from a cytidine triphosphate, turning sialic acid into cytidine monophosphate-sialic acid (CMP-sialic acid). This compound is synthesized in the nucleus of the animal cell.
In bacterial systems, sialic acids are biosynthesized by an aldolase enzyme. The enzyme uses a mannose derivative as a substrate, inserting three carbons from pyruvate into the resulting sialic acid structure. These enzymes can be used for chemoenzymatic synthesis of sialic acid derivatives.
Sialic acid-rich glycoproteins (sialoglycoproteins) bind selectin in humans and other organisms. Metastatic cancer cells often express a high density of sialic acid-rich glycoproteins. This overexpression of sialic acid on surfaces creates a negative charge on cell membranes. This creates repulsion between cells (cell opposition) and helps these late-stage cancer cells enter the blood stream.
Sialic acid also plays an important role in human influenza infections. The influenza viruses (Orthomyxoviridae) have hemagglutinin activity (HA) glycoproteins on their surfaces that bind to sialic acids found on the surface of human erythrocytes and on the cell membranes of the upper respiratory tract. This is the basis of hemagglutination when viruses are mixed with blood cells, and entry of the virus into cells of the upper respiratory tract. Widely-used anti-influenza drugs (oseltamivir and zanamivir) are sialic acid analogs that interfere with release of newly generated viruses from infected cells by inhibiting the viral enzyme neuraminidase.
Many bacteria also use sialic acid in their biology, although this is usually limited to bacteria that live in association with higher animals (deuterostomes). Many of these incorporate sialic acid into cell surface features like their lipopolysaccharide and capsule, which helps them evade the innate immune response of the host. Other bacteria simply use sialic acid as a good nutrient source, as it contains both carbon and nitrogen and can be converted to fructose-6-phosphate, which can then enter central metabolism.
Sialic acid-rich oligosaccharides on the glycoconjugates (glycolipids, glycoproteins, proteoglycans) found on surface membranes help keep water at the surface of cells. The sialic acid-rich regions contribute to creating a negative charge on the cells' surfaces. Since water is a polar molecule with partial positive charges on both hydrogen atoms, it is attracted to cell surfaces and membranes. This also contributes to cellular fluid uptake.
Sialic acid in the form of polysialic acid is an unusual posttranslational modification that occurs on the neural cell adhesion molecules (NCAMs). In the synapse, the strong negative charge of the polysialic acid prevents NCAM cross-linking of cells.
The synthesis and degradation of sialic acid are distributed in different compartments of the cell. The synthesis starts in the cytosol, where N-acetylmannosamine 6 phosphate and phosphoenolpyruvate give rise to sialic acid. Later on, Neu5Ac 9 phosphate is activated in the nucleus by a cytidine monophosphate (CMP) residue through CMP-Neu5Ac synthase. Although the linkage between sialic acid and other compounds tends to be a α binding, this specific one is the only one that is a β linkage. CMP-Neu5Ac is then transported to the endoplasmic reticulum or the Golgi apparatus, where it can be transferred to an oligosaccharide chain, becoming a new glycoconjugate. This bond can be modified by O-acetylation or O-methylation. When the glycoconjugate is mature it is transported to the cell surface.
The sialidase is one of the most important enzymes of the sialic acid catabolism. It can cause the removal of sialic acid residues from the cell surface or serum sialoglycoconjugates. Usually, in higher animals, the glycoconjugates that are prone to be degraded are captured by endocytosis. After the fusion of the late endosome with the lysosome, lysosomal sialidases remove sialic acid residues. The activity of these sialidases is based on the removal of O-acetyl groups. Free sialic acid molecules are transported to the cytosol through the membrane of the lysosome. There, they can be recycled and activated again to form another nascent glycoconjugate molecule in the Golgi apparatus. Sialic acids can also be degraded to acylmannosamine and pyruvate with the cytosolic enzyme acylneuraminate lyase.
Sialic acids are found at all cell surfaces of vertebrates and some invertebrates, and also at certain bacteria that interact with vertebrates.
Many viruses and some bacteria use host-sialylated structures as targets for binding and recognition. Viruses that bind Sia via a hemagglutinin, usually express a sialidase (neuraminidase) that catalyzes the hydrolysis of the terminal sialic acids of host cell receptors and confers virulence for the newly formed virions. 
Other immunological functions for bacterial sialidases are now becoming evident. For example, evidence indicates that free Sia can behave as a signal to some specific bacteria, like Pneumococcus. Free sialic acid possibly can help the bacterium to recognize that it has reached a vertebrate environment suitable for its colonization. Modifications of Sias, such as the N-glycolyl group at the 5 position or O-acetyl groups on the side chain, may reduce the action of bacterial sialidases. 
Scientists investigate about the functions of sialic acid, and nowadays they are trying to demonstrate if sialic acid has a relationship with fast brain growth and if it produces some advantages on the brain development. An important food of our nutrition when we were younger has an important role on these studies: human milk. It has been demonstrated that human milk contains high levels of acid sialic- glycoconjugates. In fact a study shows that, premature and full-term breast-fed at five months of age had more salivary sialic acid than formula –fed infants. However all human milk does not have the same amount of sialic acid: it depends of genetic inheritance, lactation, etc. So the investigations are focused on the effects of child who has been breast-fed, and the child who has not. Brain development is an important process for human. It is complex but it is fast too: by two years of age, the child brain reaches about the 80% of its adult weight. When children are born, they actually have all of the neurons formed; however the synaptic connections between them will be elaborated after birth. Nutrition is important in this process because it supports neural growth until the brain has reached its maximum development potential, so nutrition is important to have a well-formed brain. Acid sialic is an essential nutrient for well brain development and cognition. And it is important the moment of the administration of the input of sialic acid because if we give it when the animal is older there aren't important changes. It has been demonstrated that the human brain has more acid sialic than the brain of the other mammal (2 – 4 times more), in fact the neuron membrane has 20 times more sialic acid than other cellular membranes. So it is believed that sialic acid is decisive on the connection with these types of cells (neurons), because it makes easier the neurotransmission. . It also has been studied the effect of sialic acid supplementation on learning and memory behaviour in rodents, and then with piglets (because brain structure and function is more similar with brain human). They gave a diet rich in sialic acid to newborn piglets for five weeks. They used a visual cue in a maze to evaluate the capacity of learning and memory. Then, they saw that there exist a relationship between dietary acid sialic supplementation and cognitive function: the piglets who had been fed with high doses of sialic acid made a fastest learning and less mistakes. So it is so possible that sialic acid has an association with brain development and learning.
Sialic acids are related to some diseases observed in humans.
Salla disease is an extremely rare illness which is considered the mildest form of the free sialic acid acumuluation disorders  though its childish form is considered an aggressive variant and people who suffer from it have mental retardation. It is an autosomic recessive disorder caused by a mutation of the chromosome 6. It affects, mainly, the nervous system  and it is caused by a lisosomal storage irregularity which comes from a deficit of an specific sialic acid carrier located on the lisosomal membrane  Currently, there is no cure for this disease and the treatment is supportive and based on control symptoms.
Sialic acid and influenza virus
All influenza A virus strains need sialic acid to connect with cells. There are different forms of sialic acids which have different affinity with influenza A virus variety. This diversity is an important fact that determines which species can be infected. When a certain influenza A virus is recognized by a sialic acid receptor the cell tends to endocyte the virus so the cell become infected.